Does this work with WebGLRenderingContext? about jsgif HOT 6 CLOSED

        new function() {
                var orgCreateElement = document.createElement;
                // hijack createElement to hijack all the canvases getContext  
                Object.defineProperty(document, 'createElement', 
                {value: function(type) {
                    var ans = orgCreateElement.apply(this, Array.prototype.slice.call(arguments));
                    if (type == 'canvas') {
                        var orgGetContext = ans.getContext;
                        // hijack getContext to catch all the contexts and save then in window.mainContext (or wherever . . .) 
                        ans.getContext = function() {
                            if (!window.mainContext)
                                window.mainContext = [];
                            if (typeof arguments[1] === 'object')
                                // set preserveDrawingBuffer = true will help you with canvas.toDataURL("image/png"); method
                                arguments[1].preserveDrawingBuffer = true;
                            var c = orgGetContext.apply(this, Array.prototype.slice.call(arguments));
                            window.mainContext.push(c); 
                            return c;
                        };
                    }
                    return ans;
                }});
        }

encoder.addFrame(readBuffer, true);